Firmware Atrix 2 AT&T ICS 4.0.4 by “Firmware Team”
http://forum.xda-developers.com/showthread.php?t=1961310

[INFO] FXZ what? An explanation.
http://forum.xda-developers.com/showthread.php?t=1909319

http://sbf.droid-developers.org/edison/list.php